Press roll



Patented May 5, 1931 UNITED STATES PATENT OFFICE PRESS ROLL Application led October 4, 1929. Serial No. 397,342.

This invention relates to press rolls for paper making machines or the like.

he principal objects of the invention are to provide a very simple and inexpensive means connected with one of the press rolls for receiving the moisture as the web of paper and felt are run through the rolls and delivering the moisture at a point below without the use of complicated mechanism, such as a suction device or the like, and to provide means for effectively removing the moisture from the roll so that it will not be carried around by the roll into contact with the felt again.

Other objects and advantages of the invention will appear hereinafter.

Reference is to be had to the accompanying drawings in which Fig. 1 is a side view of one form of press 2.o roll structure to which this invention is adapted to be applied; f

Fig. 2 is a plan 'of the press roll to whichA the invention is applied; and

Fig. 3 is a transverse sectional view of the roll showing a modified form of moisture dislodging means.

It is customary to run the web of paper in a paper making machine through a series of sets of press rolls` In each case a felt is run between the rolls and under the paper web.

In the form of the invention shown the upper press roll 10 is made in the usual way except that it is cylindrical and not crowned. In order to run the presses at high speed and use large rolls some diiliculti-es have been encountered and I have shown the invention as applied to a press in which a lower idler roll 11 is used. This presses against the intermediate roll 12, which receives the felt 13 on its top, and over which the moisture is pressed out by contact between the rolls 12 and 10. In this case both rolls 10 and 12 are cylindrical and only the roll 11 is crowned. This permits an even pressure on the felt across it and without the disadvantages of crowned press rolls.

In this case the roll 12 is provided with indentations 15 on its surface. These indentations may be in an desired form and preferably are formed by grooves on the roll. These grooves may be transverse and longitudinal, as shown, in which case the depressions are square or they may be inclined or shaped in other ways, as desired. Each one is merely a surface indentation to receive moisture from the felt and carry it around to the bottom where it is supposed to be discharged because the indentations at that point are bottom side up. 60

Some of the moisture is apt to remain in the indentations and for the purpose of removing it I provide a series of air nozzles 17 extending along the roll 12 for blowing the moisture out of the indentations on the return side of the roll. In the form shown in Fig. 3, almechanical brush 18 can be employed for that purpose rotating on a convenient axis or stationary.

In the case of a two roll-press which is not illustrated herein, of course, the bottom roll will be constructed like the'roll 12 and operate in the manner. above described, but usually crowned.

In this way it will be seen that without providing a perforated roll or suction mechanism or any extra mechanism, a lower press roll can be provided with pockets or indentations at a comparatively small expense which will receive the moisture from the felt. This constitutes a means also for discharging the moisture at the bottom of the roll and it will be seen that additional means is provided for practically drying the rolls by taking away any excess moisture that might 85. follow around and come again to the top of the roll.

Although I have illustrated and described only twol forms of the invention I am aware of the fact that other modifications can be 99 'made therein by any person skilled in the art without departing from the scope of the invention as expressed in the claim. Therefore, I do not wish to be limited in this respect but what I do claim is In a, ress for a paper making machine, the com ination of three rolls, a, smooth surfaced cylindrical upper roll, a, cylindrical intermediate roll for engagement therewith having surface indentatioins and a crowned lowei`- roll on which the intermediate roll bears, said surface indentations being adapted to receive moisture at the top anddischarge it at the bottom.

In testimony whereof I have hereunto affixed my si ature.'

.II-IN WARREN VEDDER. 

